Searching from company record for names in contact dB. ACT 2011

Have a question about possibility of doing a contact search from a new company record in the company file.

When I input a new company record into my dB, can I from that record do a search in the contact dB to see if I have a person already in the contact dB at a different company?

When I come across a new company, I will search to see if they are in my company dB. If not, will input them into the dB. I would then like to check my contact dB to see if I have contacts who have joined this new company. Can I search the contact dB from my company dB?